Venerables
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These demons changed the entire world, but for us, it doesn't seem like it because we never experienced how the world was before this… Of course, so, in the end, this is often treated as tales, myths, or legends, and not as actual history.
Although I am sure that other people might do.
Though the persecution of technology users seems to be something big, as technology is qualified as a taboo, yet that one bastard had a lot.
I also asked about the Immortal Venerable figures across history, and it seems that they are some big stuff. Each Era had an Immortal Venerable that brought a change to the world in one way or another.
Immortal Venerable are Cultivators who reached Rank 10 in Cultivation of their Mana Core and acquired the power to defy and conquer heaven and earth. However, even as strong as they were, there was still something that bound them to eventually die, Fate.